Black disazo dyestuff and process of making same.



n srn'rn ATENT O FFICE.

FRANZ SCHOLL, OF HijCHST-ON-THE-MAIN, GERMANY,.ASSIGNOR T0 FARBWERKE VORM. MEISTER LUCIUS & BRU'NING, OF HGCHST-ON-THE-MAIN, GERMANY, A

ooRroRATIoN or GERMANY.

BLACK DISAZO J DYESTUFF AND PROCESS OF MAKING- SAME.

I! 0 Drawing.

To all whom it may concern:

B it known that I,'FRANz SoHoLL, Ph. D., chemist, a citizen of the Empire of Germany, residing at Hochst-on the-Main, Germany, have invented certain new anduseful Improvements in Black Disazo Dyestufi's and Processes of Making Same, of which the following is a specification.

'I have found that valuable black basic secondary disazo dyestufis canlsbe produced by diazotizing trimethylamm niumphenylazo-m-toluidin and combining it with heteronuclear oz-a-diaminonaphthalenes. These dyestuffs are black powders, soluble in water and alcohol, insoluble in ether, benzene and petroleum ether andare of great value for dyeing artificial silk.

The following example illustrates my invention: 34 kg. of hydrochlorid of trimethylaminoniumphenyl azo m toluidinv are dissolved in about 1500 liters of water and diazotized with 24 kg. of hydrochloric acid (19 B.) and 6.9- kg. of sodium nitrite. This diazo solution is run into a cooled solution of 16 kg.- of 1.8-diaminonaphthalene in 24 kg. of hydrochloric acid (19? B.) and about 600 liters of waterl After having stirred the mixture for a good time it is heated to about 50 C. and salted out by adding a solution of common salt. WVhen dry, the dyestuif formsa black powder with a'cupreous luster, soluble in waterwith a violet color, yielding on'addition of a mineral acid a dark-blue precipitate and on addition of ammonia a reddish-violet solution, soluble in concentrated sulfuric acid with a greenish-blue color and in alcohol with a bluish-violet color, insoluble in ether, benzene and ligroin, and dyes artificial silk a beautiful bluish-violet black tint.

In the place of the 1.8.diaminonaphtha- Specification of Letters Patent.

, Application filed September 20, 1911. Serial No. 650,322.

' Patented J line 4, 1912.

lene may be used the 1.5 diaminonaphtha lene.

Having now described my invention, what I claim is:

1. As new products, basic disazo dyestuffsof the constitution:

wherein R stands for a heteronuclear a-oz-diaminonaphthal'ene; being black powders, soluble in water and alcohol, insoluble in ether, benzene and petroleum-ether, dyeing artificial silk black tints.

v 2. As a new product, the basic disazo dye: stuff of the constitution:

roin, dyeing artificial silk a bluish-violet black tint.

3. The process of manufacturing basic disazo dyestuffs which consists in diazotizing trimethylammoniumphenyl-azo-m-tolui- .din and causing it to act upon heteronuclear 'ozozdiaminonaph-thalenes.

In testimony whereof, I aflix my signature in presence of two witnesses.

FRANZ SCHOLL.

WVitnesses:

JEAN GRUND, CARL GRUND.

copies'of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

